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8#S head-on accelerometer plots bumper channel sign support coefficient of correlation collision computed head impact concrete footings Criteria for Yielding Department of Transportation double posted installation double posted sign e#n head-on Federal Highway Administration Field Crash Tests field test data field testing program film analyses floor board forehead to windshield Frame gage type accelerometers head impact velocity head into windshield head to glass high head impact highest head impact Highway Sign Supports hit the windshield l3 mph l4.l mph l966 and later later model automobiles left hand post limits of head Ohio passenger's head piggy-back pre-l966 model automobiles previous field test re-analyzed resulting head impact safe limits serious injury sign marker sign posts speed film steel channel sign strain gage accelerometer strain gage type Table E-l test vehicles types of accelerometers University of Cincinnati unrestrained passenger value of head windshield distance windshield impact velocities yielding sign supports